LONDON (Reuters) – The sexually transmitted disease gonorrhea risks becoming a drug-resistant "superbug" if doctors do not devise new ways of treating it, a leading sexual health expert said. Catherine Ison, a specialist on gonorrhea from Britain's Health Protection Agency said a World Health Organization (WHO) meeting in Manila next week would be vital to efforts to try to stop the bug repeatedly adapting to and overcoming drugs. "This is a very clever bacteria. If this problem isn't addressed, there is a real possibility that gonorrhea will become a very difficult infection to treat," she said in a telephone interview....